Our God is pure love, he does not punish his children who do good, and he forgives those who do wrong, so immense is his love for us.
I consider that the flood is the cause of the mother nature angry because of so much contamination and for so much evil of the human being that only receives kindness from her and by unconscious pollutes.
When it rains, we become frightened because unforeseen events such as the flood may occur, we as Christians pray to God with faith and the heavenly father hears our pleas and calms the rain and everything returns to its cause